Means for stiffening boiler-heads.



A. INOKUTY.

MEANS FOR STIFFENING BOILER HEADS.

APPLICATION FILED um: 29, 1910.

1 00,266, Patented Aug, 8, 1911.

Wmw'

COLUMBIA PLANOORAPH CO" WAsmNmN. 0. Q

UNITED STATE PATFEJT @FFKQE.

ARIYA INOKUTY, OF TOKYO, JAPAN.

MEANS FOR STIFFENING BOILER-HEADS.

To all whom it may concern:

Be it known that I, ARIYA INOKUTY, a subject of the Emperor of Japan,residing at 4:0 Nichome, Nishiharamachi, Koishikawaku, Tokyo, Japan,have invented a new and useful Improvement in Means for StiffeningBoiler-Heads, of which the following is a specification.

This invention relates to improved means for stiffening boiler heads toenable them to withstand the internal pressure.

One of the objects of the invention is to provide improved stiffeningmeans designed to enable the use of boiler plates or heads of highpressure boilers, of a lighter weight of plate, than has been heretoforepossible.

A further object of the invention is to stiffen the heads of boilerswithout employing means extending longitudinally of the boiler from headto head.

A further object of the invention is to lessen injurious strainingaction arising from the difference of expansion or contraction betweenthe flue tube and the boiler shelf or head and also to render theinterior of the boiler more accessible for cleaning purposes.

Further objects of the invention will hereinafter appear in thedescription of the accompanying drawings and in the specific :tement ofnovelty in the claim.

. In the drawing :Figure 1 is a sectional view on line 11 of Fig. 2.Fig. 2 is a iongitudinal vertical section of the boiler illustrating theuse of my invention in connection therewith. Fig. 3 is a sectional viewon line 3-3 of Fig. 1. Fig. 4: is a sectional view on line 4-4 of Fig.1.

Like numerals of reference designate similar parts throughout thedifferent figures of the drawing.

As illustrated the means for stiffening boiler heads 1, consists of aplurality of independent elements connected with each head. In practiceit has been found that gusset plates, or angle plates, provide a simpleand effective stiffening means.

Referring to Fig. 1 it will be seen that a plurality of elements 2, 3,4:, 5, 6, are dis posed on the inside face of the heads 1 and are spacedapart from each other in a suitable manner to distribute thestrengthening functions thereof. Said elements are also spaced apartfrom the outer and inner junctures, 7 and 8 respectively, of the head 1with the boiler shell and tubes.

Specification of Letters Patent.

Application filed June 29, 1910.

Patented Aug. 8, 1911.

Serial No. 589,528.

Referring to element 2, the same consists of two angle or gusset plates9 and 10 which are shown secured together by rivets 11 and also securedto the head 1 by rivets 12. The outer margins 13 of the element 2 arespread so as to diverge from the point of juncture of the plates 9 and10 for the purpose of further stiffening the same. Furthermore theplates 9 and 10 are preferably not bent at a right angle but are curved,as at 14, so as to increase the strength thereof.

By reference to Fig. 1 it will be seen that elements 3 and 5 arerelatively shorter than element 2 and elements 4 and 6 are rela tivelyshorter than elements 3 and 5 and while this arrangement andproportioning of the elements are well adapted for the type of boilershown it will be understood that wide variations of arrangement andproportioning may be and can be utilized for boilers of different typeswithout departing from the spirit of my invention. In the presentconstruction the plate 15 of element 3 is longer than plate 16 andlikewise plate 17 of element 4 is longer than plate 18 and it will beseen that this arrangement gives the widest possible latitude ofdisposition of the stifi'ening elements to accommodate the gradualreduction of surface of the heads 1 from a point above the tube to apoint toward the sides thereof.

It will be seen that the widest possible latitude of expansion andcontraction of the two heads of the boiler may take place without oneinfluencing the other. If the tube should extend at one end more than atthe other the expansion or contraction of the head nearest to such endwould not affect the other heads. Furthermore it will be seen that theheads are efiectively stiffened by a relatively small amount of materialthere-' faces of said heads is disposed on one side of the flue than onthe other side thereof and a plurality of stiffening devices for headand the remaining flange of such pair such greater area of each head,said de secured to each other. 10 vices being radially disposed with.respect to In testimony whereof I affix my signature the longitudinalaxis of said shell and each in presence of two Witnesses.

5 device being independent of and uncon- ARIYA INOKUTY.

nected with the remaining devices, and each Vitnesses: device comprisinga pair of angle pieces UHACHI ISHINARY, having two of its flangessecured to the IIARUHIKO IIDA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

